Use otto event bus pass data activity to Fragment in Android

Today i will introduce pass data Activity and Fragment in Android, this article I use a transfer mode data in programming Android, if you do not know about the Event bus Otto, learn about it then, then I will guide you to use Otto eventbus pass data activity to fragment in android.
Here are the steps to perform data send in android.

Step 1. import libary otto event bus

add in file Gradle

dependencies {
    compile 'com.squareup:otto:1.3.8'
}

Step 2. Create layout main_activity.xml and fragment_layout.xml

main_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#cfcfcf">

    <RelativeLayout
        android:id="@+id/activityLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@android:color/white">

        <TextView
            android:id="@+id/title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Activity"
            android:textStyle="bold"/>

        <TextView
            android:id="@+id/message"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/title"/>

        <EditText
            android:id="@+id/activityData"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@+id/message"
            android:hint="pass data"/>

        <Button
            android:id="@+id/sendMessageToFragment"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@id/activityData"
            android:layout_centerHorizontal="true"
            android:onClick="sendMessageToFragment"
            android:text="Send Message To Fragment"/>

    </RelativeLayout>

    <LinearLayout
        android:id="@+id/fragmentContainer"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentRight="true"
        android:layout_below="@+id/activityLayout"
        android:orientation="vertical">
    </LinearLayout>

</RelativeLayout>

Fragment_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@android:color/white">

    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Fragment"
        android:textStyle="bold"/>

    <TextView
        android:id="@+id/message"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/title"/>

    <EditText
        android:id="@+id/editText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/message"
        android:hint="Pass Data"/>

    <Button
        android:id="@+id/submit"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/editText"
        android:layout_centerHorizontal="true"
        android:text="Send message to Activity"/>

</RelativeLayout>

Step 3. Create class OttoBus

public class OttoBus {
    private static Bus sBus;
    public static Bus getBus() {
        if (sBus == null)
            sBus = new Bus();
        return sBus;
    }
}

Step 4. Create Events Class when pass data in android

public class Events {

    public static class FragmentActivityMessage {

        private String message;

        public FragmentActivityMessage(String message) {
            this.message = message;
        }

        public String getMessage() {
            return message;
        }
    }

    public static class ActivityFragmentMessage {

        private String message;

        public ActivityFragmentMessage(String message) {
            this.message = message;
        }

        public String getMessage() {
            return message;
        }
    }

}

Step 5. Create Main.java 

public class Main extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        addFragment();
    }

    @Override
    protected void onStart() {
        super.onStart();
        OttoBus.getBus().register(this);
    }

    private void addFragment() {
        getSupportFragmentManager().beginTransaction().add(R.id.fragmentContainer, new FragmentExample()).commit();
    }

    public void sendMessageToFragment(View view) {
        EditText etMessage = findViewById(R.id.activityData);
        OttoBus.getBus().post(String.valueOf(etMessage.getText()));
    }

    @Subscribe
    public void getMessage(Events.ActivityFragmentMessage message) {
        TextView messageView = findViewById(R.id.message);
        messageView.setText(message.getMessage());
    }

    @Override
    protected void onStop() {
        super.onStop();
        OttoBus.getBus().unregister(this);
    }
}

Step 6. Create Fragment.java

public class FragmentExample extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.demo_fragment, container, false);
    }

    @Override
    public void onStart() {
        super.onStart();
        OttoBus.getBus().register(this);
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        setClickListener(view);
    }

    public void setClickListener(final View view) {
        Button btnSubmit = (Button) view.findViewById(R.id.submit);
        btnSubmit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                sendMessageToActivity();
            }
        });
    }

    private void sendMessageToActivity() {
        EditText etMessage = getView().findViewById(R.id.editText);
        OttoBus.getBus().post(etMessage.getText().toString());
    }

    @Subscribe
    public void getMessage(Events.FragmentActivityMessage message) {
        TextView messageView = getView().findViewById(R.id.message);
        messageView.setText(message.getMessage());
    }

    @Override
    public void onStop() {
        super.onStop();
        OttoBus.getBus().unregister(this);
    }
}